Force-pump



UNITED STATES PATE T OFFICE.

DECEASED. OF MARENGO,

MICHIGAN, ASSIGNOR OF ONE-HALF TO CHARLES H. MORSE, OF CHICAGO,ILLINOIS.

I- 'OR CE-PU M P.

SPECIFICATION forming part of Letters Patent No. 243,639, dated June 28,1881.

Application filed March 9, 1881. (No model.)

To all whom it may concern:

Be it known that MONTGOMERY ORossMAN, late a resident of the city ofMarshall, in the county of Calhoun, State of Michigan, (deceased,) didinvent certain new and useful Improvements in Double-Acting Force-Pumps,of which'the following specification is a full, clear, and exactdescription, reference being had to the accompanying drawings.

This invention relates to the general construction and arrangement ofthe valves, valvechambers, and cylinders of force-pumps, the objectbeing to make them more compact and theparts liable to wear out easilyand separately accessible for repairs. I attain these objects by meansof the construction and arrangement illustrated by the accompanyingdrawings, in which- Figure 1 is a perspective view. Fig. 2 is ahorizontal section through the upper valvechambers and water-passages ofthe head A A. Fig. 3 is ahorizontal section through the lower valvechambers and waterpassages of the head A A. Fig. 4 is a vertical annularsection through the valve -chambers and waterpassages of the head A A,developed into a straight section. Fig. 5 is a vertical section of thepump as a whole. Fig. 6 is a plan of the valve-seats. Fig. 7 is avertical section, showing the arrangement and construction of thevalve-caps, valves, and valve-seats on a larger scale.

The upper head, A A, containing the valvechambers and water-passages P QR N O S, is cast in one piece, the chambers being formed with cores. I

The inner or piston cylinder, T, is open at both ends, and is secured tothe valve-head A A by flanges and bolts, or by being screwthreaded atits upper end. It is preferably made of seamless drawn brass tubing.

The outer cylinder, B, which is concentric with cylinder T, so as toleave a free passage, a, on all sides, may be connected to both heads AAandbaseC by thread orby flange and belts; or it may be cast in one piecewith the base 0 and screw threaded at top or connected by flange andbolts with head A A. The inner cylinder, T, does not quite reach thebase C, so as to leave a passage, to, at the bottom.

The valve-caps E, F, G, and H give access to the valves 0, f, g, and It,(shown in section in Fig. 4, and more clearly in Figs.'6 and 7, wherethe valve-cap k is shown screw-threaded into the upper shell, m, of thevalve-chamber.) This valve-cap is bored partly through from the underside, as shown by dotted lines, to receive the valve-stem d of the valve0, which plays freely up and down, closing on the valveseat a. By makingthe valve-stem d longthe need of a projection from the under side of thevalve is avoided, leaving the water-Way unobstructed. The valve-seat amay be formed, as shown, of brass or other metal, screw-threaded intothe middle horizontal partition of the head A A, with small lugs I) bfor convenience of screwing or unscrewing; orit may be formedupon thepartition itself.

D is the inlet-passage, opening directly into the chamber S, beneath thetwo inlet-valves e and g.

J is the air-chamber, and K is the dischargepipe. The air-chambercommunicates directly with the chamber Q, containing the dischargevalvesf and h.

L is the piston-rod, and X is a solid piston.

I is the head closing the top of the pump.

The action of the pump will be understoodby reference to Figs. 2, 3, 4,and 5. Take the upper end of the piston-cylinder and trace the actionofthe pump through one descent and ascent of the piston 00. When thepiston descends a vacuum is formed in chamber P and water rushes inthrough D into chamber S, up through valveeinto chamber 1?, thencethrough passage V into the top of cylinder T, following the piston tothe end of its stroke. As the piston returns toward the top of thecylinder valve 0 closes and the water is forced through passage V intochamber P, down through port 1) into chamber 0, up through valve f intochamber Q, and, since the pressure closes valve h, it is forcedinto'air-chamber J and discharged through pipe K. Now, consider theaction taking place with reference to the lower end of cylinder T. Asthe piston ascends a vacuum is formed in the space a between the twocylinders. Water rushes in through D into S, up through valve 9 into It,down through 12 into N, thence into passage u and w, and follows thepiston to the end of the stroke. When the piston begins to descend valveg closes and the water returns through to and u to chamber N, raisesvalve h, and passes into chamber Q, closing valve f, and escapes throughpipe K, as in the other case. So, while water is being taken in at oneend of the cylinder, wateris also being discharged at the other end.

In the pumps in common use, both single and double acting, whenever theinside or piston cylinder is worn out, the whole pump must be replacedwith new, because there is no provision made for renewing the separateparts, the piston-cylinder being made in one piece with the top. WVithmy. arrangement every partcylinder, valve, and valve-seats, &c.- iseasily accessible for examination and repairs without removing the pumpfrom its foundation. This is facilitated by arranging and connectingeverything at the top-inlet D, valves, and discharge-all in one compacthead at top of the pump.

I am aware that double cylinders have been before used in pumps; butthese have all been sin gle-acting, having a valve at the bottom andpassing the water through the plunger. I am also aware that valveshaving stems have been heretofore used; but these have had also aprojection below, thus obstructing the waterway, while mine has a longstem above, passin g into the valve-cap sufliciently to steady the valveand allow a free and unobstructed play. I therefore do not broadly claimeither the use of two concentric cylinders in pumps or, broadly, the useof valves with stems.

I am aware that a series of valves placed at the upper end of thecylinder of a pump, so that by removing the cover all the valves and theplungers are exposed to View, is old, and such I do not wish to beundersto'od as claiming, broadly, as of my invention.

Having thus described myinvention, what I claim, and desire to secure byLetters Patent, 1s

1. In a double-acting force pump, the combination of the two concentriccylinders B T, the head A A, arranged at the top of said cylinders, andhaving the upper chambers, P QR, and lower chambers, O N S, valves andinlet and discharge openings, and the plungerw, the several partsconstructed and arranged relatively to each other substantially in themanner as and for the purpose herein shown and described.

2. In a double-acting force-pump, the combination of two concentriccylinders, B and T, having a free unobstructed space between the sidesand bottom thereof, and the chambered head A A, arranged at the top ofsaid cylinders, and containing the inlet-openin g, valves, anddischarge-opening, substantially as and for the purpose herein shown anddescribed.

WILLIAM P. SLAYTON, Ad'mm istmtor of the estate oflll'ontgomcry(h'ossman, deceased.

NVitnesses WM. H. PORTER, GEORGE INGERSOLL.

